Definition:Decagon/Regular
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Definition
A regular decagon is a decagon which is both equilateral and equiangular.
That is, a regular polygon with $10$ sides.
That is, a decagon in which all the sides are the same length, and all the vertices have the same angle:
Linguistic Note
The word decagon derives from the Greek deka, meaning ten, and gon, deriving from the Greek for corner.